This folder contains PDF's containing ND documentation. They have been scanned and OCR'ed from original paper documentation.
Introduction to the hardware changes in the ND-120
See also the video training delivered by Lasse Bockelie and Chris Cherrington, the original hw designers.
- ND-120 - DELILAH - Hardware Introduction - Part 1 of 2
- ND-120 - DELILAH - Hardware Introduction - Part 2 of 2
These documents are for the ND-110 CPU and Architecture. The functional description and instruction set is identical in the ND-120.
This document contain details on how to program the microcode in the ND-110 and ND-110 CPU.
The differences between ND-110 and ND-120 is mainly speed (about 1.5x) as the "Cpu Gate Array/DELILAH" chip is able to run at higher speed (with shorter cycle times) then the original discrete TTL chips in the ND-110.
The ND-120 can also address more RAM, up from 2MB on the ND-110 to 6MB on the ND-120.
The ND-120 finally moved to RS-232 for the console, while all earlier models from Nord-1 used current-loop. This detail is hidden from the operating system by the microcode that addresses the on-board UART.